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Upon irradiating californium with neutro...

Upon irradiating californium with neutrons, a scientist discovered a new nuclide having mass scientist discovered a new nuclide having mass number of 250 and a half-life of `0.50hr`. Three hours after the irradiation the observated radioactivity due to the nuclide was `10 dis//min`. How many atoms of the nuclide were perepared initially?

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The correct Answer is:
`2.766xx10^(4)` atoms
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